I've also experienced shingles outbreak nerve pain, and yin yoga is an important part of my life. It sounds like you're asking for suggestions of yin postures/inspirations/techniques/methodology/pedagogy to support with the pain experience? While I haven't found a specific go-to posture when I practice, supine poses with the focus is on the hips and heart space feel appropriate.
What Bernie mentioned about the meditative aspect has been one important piece of my acceptance and recovery: by taking time to slow down, listen in, and feel. The biggest impact for me has been exploring how pain and illness act as indicators and protectors of past trauma's repressed emotions such as anger and grief - through the TMS lens and intersection of Buddhist and western psychology, psychoneuroimmunology, and in general the mindbody connection.
If you're interested in the emotional connection piece I'd recommend the TMSwiki website, any and all books by Dr. John Sarno, Radical Acceptance by Tara Brach, Peace, Love, and Healing by Bernie Siegel, Unlearn Your Pain by Howard Schubiner, and if any of this resonates, that all leads to learning about what role your illness or pain (presented as shingles) plays to keep you safe and meet your needs. If this doesn't resonate I hope you find your own way through the experience that brings you healing and joy.
I know the virus and the pain and other symptoms are real and can be excruciating, debilitating, and have a huge impact on the life experience. Thanks for reaching out to the community and for sharing, I'm grateful to be able to write a bit about my experience in hopes of helping others
I'm open to suggested resources as well!
May we be free from suffering. May we be healthy. May we be happy. May we find peace and joy.